We are currently living in the Phanerozoic Eon and the Cenozoic Era.
a. true
b. false
a. true
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Why does an atom with many valence electrons tend to gain electrons rather than lose any?
A. Atoms with many valence electrons tend to have relatively strong forces of attraction between the valence electrons and the nucleus. This makes it easy for them to gain additional electrons. B. Atoms with many valence electrons tend to have relatively weak forces of attraction between the valence electrons and the nucleus. Therefore, the outer electrons are free to attract other electrons. C. There is stability in numbers. Atoms with many valence electrons are always attracting new electrons. D. The old adage that "he who has, gets" is also true in atomic structure. Atoms with many valence electrons can essentially overpower atoms with few valence electrons and attract additional electrons.
Tiny solids or liquids suspended in the atmosphere— including dust and pollutants— are called ____
a. lapses b. aerosols c. isotherms d. tropopauses e. ionospheres
Why do crystals in a magma stop growing during cooling?
A) The pressure from rocks above becomes too great and the magma stops growing crystals. B) They run out of heat. C) They become too dense to grow. D) They run out of space.
Which of the following is not an abiotic factor?
A) sunlight B) rainfall C) carbon and nitrogen levels D) bacteria E) temperature